* = added to this page fairly recently.
this page highlights the various semi-obscure trinkets of sondheim lore that exist and that you might see on ebay every once in a while, such as a cassette of the liza minelli/pet shop boys version of "losing my mind" or the CD of judi dench's performance in a little night music
disclaimer: a lot of this is information compiled from such sources as ebay and amazon, so i can't make any guarantees about their accuracy. feel free to contact me with corrections or additions.
an interesting difference in the two editions is that at the end of the 1986 edition george's "off and running" monologue is reprinted with the note that it was intended to be "delivered by the first-act George" but "was cut in previews." in the 1991 edition this monologue is inserted verbatim immediately following "it's hot up here" in act II and immediately before the rest of the characters' reactions to the news of seurat's death (cf 1986, pg. 140 to 1991, pgs. 130-131.) in a licensed production i saw recently this monologue was definitely not present, nor was it performed at the kennedy center production.
playbills usually run from $5-$10, and appear on ebay frequently. posters usually run from $20-$40, unless they're rare. a good source for some common ones is applauseonline.com.